This is my first try at pressure fermenting. I have a ale that has dropped from 1.052 to 1.021 at which point I attached the spunding valve on my corny keg. I added 5 PSI of pressure and it quickly bled off. I messed around with it. I wound up adding 15 psi of pressure and bled it off to 10 lb of PSI. I got up this morning and it was reading 0. My keg has all new o-rings. Could the CO2 be absorbing into the beer? Or do I have a leak in my spunding valve?